CN101867093A - Ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna - Google Patents
Ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna Download PDFInfo
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- CN101867093A CN101867093A CN 201010199159 CN201010199159A CN101867093A CN 101867093 A CN101867093 A CN 101867093A CN 201010199159 CN201010199159 CN 201010199159 CN 201010199159 A CN201010199159 A CN 201010199159A CN 101867093 A CN101867093 A CN 101867093A
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Abstract
The invention relates to an ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna, comprising a metal radiating element I, a metal radiating element II, a double T-shaped metal feedback ring and a tabulate insulating medium substrate. A U-shaped metal micro-strip patch mode is adopted for the metal radiating element I, and a non-isometric broken line type metal micro-strip patch mode is adopted for the metal element II. The tabulate insulating medium substrate is arranged below the metal radiating element I and the metal radiating element II. The double T-shaped metal feedback ring is positioned between the U-shaped metal micro-strip patch and the non-isometric broken line type metal micro-strip patch, and the center of the double T-shaped metal feedback ring is positioned on the center lines of the U-shaped metal micro-strip patch and the non-isometric broken line type metal micro-strip patch. The double T-shaped metal feedback ring, the U-shaped micro-strip patch and the non-isometric broken line type metal micro-strip patch are positioned on the same plane, and the an antenna feed position is located at the tail end of the double T-shaped metal feedback ring. The invention has the advantages of simple stricture, wide broadband, high gain, quasi circular polarization, adjustable working frequency, easy machining and low cost.
Description
Technical field
The invention belongs to the non-contact automatic identification technology field, specifically, relate to a kind of label antenna that is applicable in the passive radio frequency identification system, especially relate to a kind of ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna with double T shape metal feedback loop.
Background technology
Radio-frequency (RF) identification (RFID) technology has been acknowledged as one of big important technology of 21 centurys ten as fast, in real time, accurately gathering and the new and high technology of process information and the basis of information standardization.On application prospect, commercial, enterprise, even government all sees emerging RFID as general, a ubiquitous automatic identification technology.RFID is a kind of contactless automatic identification and data collection technology, and operation need not manual intervention, at industry-by-industries such as production, retail, logistics, traffic wide application prospect is arranged.Radio-frequency recognition system is made up of reader and label usually, and antenna is the core component of label.
Existing ultrahigh frequency RFID micro-strip paster antenna structure has usually: antenna structures such as square patch corner cut, single T shape coupling, single induction feedback loop coupling, the coplane shape of falling F and meander configuration dipole.Single T shape is mated antenna structure owing to have bigger input resistance value, thereby can become very difficult with the label chip coupling with less resistive characteristic, that is to say that it can not satisfy the requirement that directly is complementary with the label chip with high impedance phase angle.Single induction feedback loop coupling antenna structure, only effective to label microchip with high impedance phase angle, then be difficult to realize tuning to the label chip of other type.Coplane inverted-F antenna structure and meander configuration dipole antenna configuration all require the folding one or many of radiant body, and coplane inverted F shaped antenna structure needs to increase a ground plane in addition.The major advantage that coplane inverse-F antenna structure has is: antenna impedance shows as high capacitive reactance, so be specially adapted on the high capacitive reactance material; Secondly, because there is big ground plane in it, so also be suitable in the environment of metal surface; But its weak point is mainly: the existence of big ground plane and short circuit pin makes antenna manufacture difficulty, and cost is higher.Compare with the straight dipole sub antenna of equal height, the meander configuration dipole antenna can be obtained less resonance frequency under the cost that reduces bandwidth and lower efficiency, promptly obtaining under the identical resonance frequency condition, the curved antenna size is than little many of the size of traditional linear pattern antenna, but its far-field radiation characteristic is relatively poor.
Summary of the invention
In order to overcome the above-mentioned defective that prior art exists, the invention provides a kind of simple in structurely, size is less, wide bandwidth, high-gain, quasi circular polarization, low cost of manufacture, the far-field radiation characteristic is the ultrahigh frequency broadband circularly polarization microstrip patch antenna preferably.
Technical scheme of the present invention is: it comprises metal radiating element I, metal radiating element II, double T shape metal feedback loop, tabular dielectric substrate, metal radiating element I adopts U-shaped metal micro-strip patch form, metal radiating element II adopts non-equidistant broken line type metal micro-strip patch form, tabular dielectric substrate is located at the below of metal radiating element I and metal radiating element II, double T shape metal feedback loop is between U-shaped metal micro-strip paster and the non-equidistant broken line type metal micro-strip paster, and double T shape metal feedback loop is centered close on the center line of U-shaped metal micro-strip paster and non-equidistant broken line type metal micro-strip paster, double T shape metal feedback loop, U-shaped metal micro-strip paster and non-equidistant broken line type metal micro-strip paster are in same plane, and antenna feed location is in double T shape metal feedback loop end.
Described tabular dielectric substrate is a rectangle, and manufactured materials is epoxy resin board, glass mat or flexible polyester (FlexiblePolyester).
The antenna feed location of described double T shape metal feedback loop is provided with pad.
Described double T shape metal feedback loop thickness, U-shaped metal micro-strip paster thickness are all identical with non-equidistant broken line type metal micro-strip paster thickness.
The all available copper layer that is covered in tabular dielectric substrate surface of described U-shaped metal micro-strip paster and non-equidistant broken line type metal micro-strip paster replaces, and is beneficial to reduce the antenna manufacturing cost.
Use the present invention, the label special chip places the pad top, because the existence of pad, the present invention's ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna adopts the direct feed form, without any need for feeder equipment or impedance matching network, be beneficial to further make antenna miniaturization, simplify the structure, reduce manufacturing cost.
The present invention's ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna and traditional label antenna relatively have simple in structurely, compact, and size is less, wide bandwidth, and high-gain, quasi circular polarization, operating frequency is adjustable, advantages such as easily processing, low cost.The present invention not only has the advantage of T shape coupling, induction feedback loop and broken line type antenna, and it is bigger to have overcome existing single T shape coupling, single induction feedback loop and the coplane of falling F antenna size, impedance bandwidth, axial ratio bandwidth is narrower and be difficult to defective with existing label chip coupling; With existing other multistage T shape coupling, induction feedback loop and broken line type antenna ratio, ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna of the present invention is relatively simple for structure, cost is lower, more be applicable to the broadband, high-gain, circular polarization, compact conformation, passive RFID application cheaply.
Description of drawings
Fig. 1 is an embodiment of the invention antenna geometries front view;
Fig. 2 is an antenna geometries vertical view embodiment illustrated in fig. 1.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
With reference to Fig. 1,2, present embodiment comprises metal radiating element I, metal radiating element II, double T shape metal feedback loop 3, tabular dielectric substrate 5, metal radiating element I adopts U-shaped metal micro-strip paster 1 form, metal radiating element II adopts non-equidistant broken line type metal micro-strip paster 2 forms, be beneficial to make antenna tuning easily, increase bandwidth, size reduction and realization quasi circular polarization far-field radiation characteristic; Tabular dielectric substrate 5 is located at the below of metal radiating element I and metal radiating element II, double T shape metal feedback loop 3 is between U-shaped metal micro-strip paster 1 and the non-equidistant broken line type metal micro-strip paster 2, and double T shape metal feedback loop is centered close on the center line of U-shaped metal micro-strip paster 1 and non-equidistant broken line type metal micro-strip paster 2, double T shape metal feedback loop 3, U-shaped metal micro-strip paster 1 and non-equidistant broken line type metal micro-strip paster 2 are in same plane, be beneficial to make antenna tuning easily, more compact structure realizes the single layer microstrip patch antenna structure; Antenna feed location 4 is in double T shape metal feedback loop 3 ends.
Described tabular dielectric substrate 5 is a rectangle, and manufactured materials is epoxy resin board, glass mat or flexible polyester (FlexiblePolyester).
The antenna feed location 4 of described double T shape metal feedback loop 3 is provided with pad 6.
Described double T shape metal feedback loop 3 thickness, U-shaped metal micro-strip paster 1 thickness are all identical with non-equidistant broken line type metal micro-strip paster 2 thickness.
Described U-shaped metal micro-strip paster 1 and the non-equidistant broken line type metal micro-strip paster 2 all available copper layers that are covered in tabular dielectric substrate 5 surfaces replace, and are beneficial to reduce the antenna manufacturing cost.
The length of described U-shaped metal micro-strip paster 1 is L, and width is W, and thickness is H
c, the axial width of x is g; Described non-equidistant broken line type metal micro-strip paster 2 thickness are H
cOn the x direction of principal axis and the distance between the U-shaped metal micro-strip paster be c, the distance with U-shaped metal micro-strip paster on the y direction of principal axis is k, the broken line spacing is a and b, the width of broken line is s, and the spacing that embeds the non-equidistant broken line type metal micro-strip paster at double T shape metal feedback loop 3 places is m; Double T shape metal feedback loop 3 width are t, and thickness is H
c, the distance with U-shaped metal micro-strip paster on the x direction of principal axis is f, and the distance with non-equidistant broken line type metal micro-strip paster on the x direction of principal axis is d, and the distance with non-equidistant broken line type metal micro-strip paster on the y direction of principal axis is n; Antenna feed location 4 be positioned at double T shape metal feedback loop 3 terminal and with the both arms of double T shape metal feedback loop 3 at a distance of e; The length of tabular dielectric substrate 5 is L, and width is W, and thickness is H
s
By increase double T shape metal feedback loop 3 and non-equidistant broken line type metal micro-strip paster apart from d, increase double T shape metal feedback loop 3 width t, dwindle double T shape metal feedback loop 3 and U-shaped metal micro-strip paster apart from f, increase double T shape metal feedback loop 3 and non-equidistant broken line type metal micro-strip paster apart from n, reduce the distance c of U-shaped metal micro-strip paster and non-equidistant broken line type metal micro-strip paster, reduce the spacing a or the b of non-equidistant broken line type metal micro-strip paster, and the width s of non-equidistant broken line type metal micro-strip paster, can obviously reduce the resonance frequency of described antenna, thereby help reducing antenna size, and the impedance bandwidth of the present invention's ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna, gain and far-field radiation characteristic almost remain unchanged, and can make antenna be operated in global shf band RFID standard (840-960MHz) by adjusting above-mentioned parameter.
Use the present invention, label special chip 7 places pad 6 tops, because the existence of pad 6, the present invention's ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna adopts the direct feed form, without any need for feeder equipment or impedance matching network, be beneficial to further make antenna miniaturization, simplify the structure, reduce manufacturing cost.
Claims (5)
1. ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna, comprise metal radiating element I, metal radiating element II, double T shape metal feedback loop, tabular dielectric substrate, it is characterized in that, metal radiating element I adopts U-shaped metal micro-strip patch form, metal radiating element II adopts non-equidistant broken line type metal micro-strip patch form, tabular dielectric substrate is located at the below of metal radiating element I and metal radiating element II, double T shape metal feedback loop is between U-shaped metal micro-strip paster and the non-equidistant broken line type metal micro-strip paster, and double T shape metal feedback loop is centered close on the center line of U-shaped metal micro-strip paster and non-equidistant broken line type metal micro-strip paster, double T shape metal feedback loop, U-shaped metal micro-strip paster and non-equidistant broken line type metal micro-strip paster are in same plane, and antenna feed location is in double T shape metal feedback loop end.
2. ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna according to claim 1 is characterized in that, described tabular dielectric substrate is a rectangle, and manufactured materials is epoxy resin board, glass mat or flexible polyester.
3. ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna according to claim 1 and 2 is characterized in that, the antenna feed location of institute's double T shape metal feedback loop is provided with pad.
4. ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna according to claim 1 and 2 is characterized in that, described double T shape metal feedback loop thickness, U-shaped metal micro-strip paster thickness are all identical with non-equidistant broken line type metal micro-strip paster thickness.
5. ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna according to claim 1 and 2 is characterized in that, described U-shaped metal micro-strip paster and non-equidistant broken line type metal micro-strip paster all replace with the copper layer that is covered in tabular dielectric substrate surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010199159 CN101867093B (en) | 2010-06-12 | 2010-06-12 | Ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010199159 CN101867093B (en) | 2010-06-12 | 2010-06-12 | Ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna |
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| Publication Number | Publication Date |
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| CN101867093A true CN101867093A (en) | 2010-10-20 |
| CN101867093B CN101867093B (en) | 2013-06-05 |
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| CN 201010199159 Expired - Fee Related CN101867093B (en) | 2010-06-12 | 2010-06-12 | Ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156850A (en) * | 2011-04-22 | 2011-08-17 | 湖南大学 | UHF (Ultra High Frequency) RFID (Radio Frequency Identification) gateway blind spot testing system and probabilistic forecasting method |
| CN103050786A (en) * | 2011-10-17 | 2013-04-17 | 上海华虹计通智能系统股份有限公司 | Planar one-way antenna assembly and realizing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060223439A1 (en) * | 2005-03-31 | 2006-10-05 | Georgia Tech Research Corporation | Wireless repeater assembly |
| CN101299486A (en) * | 2008-06-18 | 2008-11-05 | 北京邮电大学 | RFID reader-writer antenna capable of overlapping high-frequency and ultrahigh frequency as well as microwave frequency band |
-
2010
- 2010-06-12 CN CN 201010199159 patent/CN101867093B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060223439A1 (en) * | 2005-03-31 | 2006-10-05 | Georgia Tech Research Corporation | Wireless repeater assembly |
| CN101299486A (en) * | 2008-06-18 | 2008-11-05 | 北京邮电大学 | RFID reader-writer antenna capable of overlapping high-frequency and ultrahigh frequency as well as microwave frequency band |
Non-Patent Citations (1)
| Title |
|---|
| 《 Antennas and Propagation Society International Symposium 2006,IEEE》 20060714 Chihyun Cho Design of Novel RFID Tag Antennas for Metallic Objects 说明书第二部分以及附图1 1-5 , * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156850A (en) * | 2011-04-22 | 2011-08-17 | 湖南大学 | UHF (Ultra High Frequency) RFID (Radio Frequency Identification) gateway blind spot testing system and probabilistic forecasting method |
| CN102156850B (en) * | 2011-04-22 | 2013-11-06 | 湖南大学 | probabilistic forecasting method of UHF (Ultra High Frequency) RFID (Radio Frequency Identification) gateway blind spot testing system |
| CN103050786A (en) * | 2011-10-17 | 2013-04-17 | 上海华虹计通智能系统股份有限公司 | Planar one-way antenna assembly and realizing method thereof |
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| CN101867093B (en) | 2013-06-05 |
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